Registration Dossier
Registration Dossier
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EC number: 204-506-4 | CAS number: 121-91-5
Phototransformation in water
Administrative data
Link to relevant study record(s)
Description of key information
Studies of photolysis in water are not necessary for isophthalic acid.
Key value for chemical safety assessment
Additional information
Studies of phototransformation in water are not required for isophthalic acid.
Under environmental conditions, photolysis is unlikely to make a significant contribution to the dissipation of isophthalic acid (or its salts), compared to the rate of its removal by biodegradation.
Support for this view is provided by the analytical data from a study of the effect of isophthalic acid on the growth of the unicellular aquatic alga Desmodesmus subspicatus (Knacker et al., 1993c): the concentration of isophthalic acid, initially dosed as sodium isophthalate ton non-sterile aqueous algal growth test medium at 67.9, 298 and 1023 mg IPA-equiv/L (measured), was reduced by ca. 16% over the course of 96 -h incubation under constant illumination at pH ca. 7.0 and 23 degrees C. Although this small reduction may have been the result of biodegradation, photolysis, hydrolysis or any combination of these processes, these data (DT50 >4 days) suggest that IPA is not prone to rapid photolysis in the aquatic environment. Ready biodegradability test data, on the other hand, show >60% mineralisation (CO2 production) within 5 -7 days when IPA was dosed at 10 and 20 mg/L (Lebertz, 1991a).
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